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Hailing from the hinterlands of science fiction, the superhero genre has a history of asking speculative questions about the future. During the 1960s, a time when the promise of the burgeoning space age contrasted sharply with cold war nuclear fears, DC Comics pioneered the exploration of possible futures. Some of these imaginary stories—an awkward term that DC used to describe stories set outside of canonical continuity—offer tantalizing glimpses into worlds that might, or might not, one day come to pass.

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